Diving mask



FIG. 1 is a perspective view of a diving mask showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a side elevational view thereof; looking toward the right side thereof. 

The ornamental design for a diving mask, substantially as shown. 